CN114124189B - Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label - Google Patents
Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label Download PDFInfo
- Publication number
- CN114124189B CN114124189B CN202111133773.3A CN202111133773A CN114124189B CN 114124189 B CN114124189 B CN 114124189B CN 202111133773 A CN202111133773 A CN 202111133773A CN 114124189 B CN114124189 B CN 114124189B
- Authority
- CN
- China
- Prior art keywords
- satellite
- label
- link
- forwarding table
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a low-rail load network inter-satellite link rapid protection method based on a pressed preset label, and relates to a route exchange technology in the field of satellite networks. In a low-orbit satellite communication system, a label forwarding table and a preset label are calculated in advance for a link to be protected, and the label forwarding table is injected into a satellite-borne switch, when the satellite-borne switch detects that the link is invalid, the preset label is pressed into a data packet head, a path indicated by the preset label bypasses a invalid node or a link, the influenced service is transferred to a backup path in the shortest time and is sent to a destination node, then the satellite-borne switch reports link information to a space-based network controller, the controller performs path recalculation according to the link information, the updated label forwarding table is injected into a corresponding satellite-borne switch, and the satellite-borne switch performs addressing forwarding on a data packet according to the updated label forwarding table, so that the service path is kept smooth, and the communication efficiency is improved.
Description
Technical Field
The invention relates to a low-rail load network inter-satellite link rapid protection method based on a pressed preset label, and relates to a route exchange technology in the field of satellite networks.
Background
The low-orbit satellite communication system has the advantages of short transmission delay, small link loss, convenient terminal miniaturization design and the like, so that the research of the low-orbit satellite networking technology is gradually focused on. However, in order to realize global seamless service, the low-orbit satellite system often needs hundreds to thousands of satellites to carry out networking, the network scale is very large, the network topology is highly dynamic, the inter-satellite-to-earth links are frequently switched, once an emergency situation is encountered, the problems of long time delay, high error rate and the like of the satellite links can be caused, so that the rapid rerouting technology is very important for the low-orbit satellite carrier network.
The method has the advantages of simple algorithm and low overhead on the satellite, and overcomes the defects of limited on-satellite computing capacity and frequent topology change in the satellite network. However, this method is less robust and once a node failure or link failure occurs in the network, the static routes calculated from the predicted topology changes are no longer valid. When a network link or node fails due to an emergency, traffic transmission is inevitably interrupted, and the duration of the traffic interruption depends on the re-convergence speed of the routing protocol.
Disclosure of Invention
In view of the above, the present invention provides a method for rapidly protecting inter-satellite links of a low-orbit load-bearing network based on a pressed preset label, which can transfer the affected service to a backup path and send the service to a destination node in the shortest time when a satellite node in a low-orbit satellite communication system is destroyed or the inter-satellite link fails, thereby keeping the service path smooth, reducing the flow loss and the out-of-order, ensuring the reliable transmission of service data, and improving the communication efficiency.
The purpose of the invention is realized in the following way:
a low-rail load-bearing inter-satellite link rapid protection method based on a pressed preset label comprises the following steps:
(1) The space-based network controller calculates a label forwarding table of each satellite node and a preset label after each link is invalid in the low-orbit satellite bearing network according to satellite ephemeris information, and injects the preset label into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches the label forwarding table through a destination label encapsulated in a data packet to carry out addressing forwarding;
(2) When the satellite-borne switch detects that the link between the connected satellites is invalid, pressing the preset label into the data packet head, and then addressing and forwarding the data packet through the label forwarding table in the step (1) according to the newly pressed preset label by the satellite-borne switch;
(3) The satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) The space-based network controller re-performs forwarding table and label centralized calculation according to the detection information of the link failure, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) And (3) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
Further, in the step (1), the space-based network controller divides the inter-satellite network topology in one orbit period into a plurality of time slices according to satellite ephemeris information, performs route calculation for each time slice, and uploads the calculation result to the satellite-borne switch of the corresponding satellite in the form of a label forwarding table; in addition, for each time slice, a preset label of the connected inter-satellite link is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
Further, the destination label encapsulated in the data packet in the step (1) is the original destination label before the link is disabled.
Further, the label forwarding table calculated by the space-based network controller in the step (1) includes a correspondence between the destination label and the output port.
Further, in the step (2), the packaging position of the preset label is located before the target label in the step (1); and after the link is invalid, bypassing the invalid link through the preset label.
Further, in step (4), the new label forwarding table is updated with the egress port information compared with the label forwarding table in step (1), and the egress port information directs the data packet to bypass the failed link for addressing forwarding.
Compared with the prior art, the invention has the following advantages:
when the satellite node is destroyed or the inter-satellite link is invalid, the method can lead the data packet to bypass the destroyed node or the invalid link by pressing in the preset label, transfer the affected service to the backup path and send the service to the destination node in the shortest time, and update the label forwarding table by the space-based network controller, thereby keeping the service path smooth, reducing the flow loss and the out-of-order, ensuring the reliable transmission of the service data and improving the communication efficiency.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a schematic diagram of a fast routing method for a low-orbit satellite-borne network according to an embodiment of the present invention.
Detailed Description
A low-rail load-bearing inter-satellite link rapid protection method based on a pressed preset label comprises the following steps:
(1) The space-based network controller calculates a label forwarding table of each satellite node and a preset label after each link is invalid in the low-orbit satellite bearing network according to satellite ephemeris information, and injects the preset label into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches the label forwarding table through a destination label encapsulated in a data packet to carry out addressing forwarding;
(2) When the satellite-borne switch detects that the link between the connected satellites is invalid, pressing the preset label into the data packet head, and then addressing and forwarding the data packet through the label forwarding table in the step (1) according to the newly pressed preset label by the satellite-borne switch;
(3) The satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) The space-based network controller re-performs forwarding table and label centralized calculation according to the detection information of the link failure, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) And (3) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
Further, in the step (1), the space-based network controller divides the inter-satellite network topology in one orbit period into a plurality of time slices according to satellite ephemeris information, performs route calculation for each time slice, and uploads the calculation result to the satellite-borne switch of the corresponding satellite in the form of a label forwarding table; in addition, for each time slice, a preset label of the connected inter-satellite link is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
Further, the destination label encapsulated in the data packet in the step (1) is the original destination label before the link is disabled.
Further, the label forwarding table calculated by the space-based network controller in the step (1) includes a correspondence between the destination label and the output port.
Further, in the step (2), the packaging position of the preset label is located before the target label in the step (1); and after the link is invalid, bypassing the invalid link through the preset label.
Further, in step (4), the new label forwarding table is updated with the egress port information compared with the label forwarding table in step (1), and the egress port information directs the data packet to bypass the failed link for addressing forwarding.
The following is a more specific example:
as shown in fig. 1, a method for quickly protecting a low-rail load inter-satellite link based on a pressed preset label comprises the following steps:
(1) The space-based network controller calculates a forwarding table and a preset backup label corresponding to each satellite node in the satellite bearing network, and injects the forwarding table into a satellite-borne switch of each satellite, and the satellite-borne switch carries out addressing forwarding on the data packet according to the forwarding table;
(2) When the satellite-borne switch detects that the link fails, a preset backup label is pressed into a data message header, and then the satellite-borne switch performs addressing forwarding on the data packet according to the newly pressed backup label;
(3) The satellite-borne switch reports the link information and the pressed backup label information to the space-based network controller;
(4) And the space-based network controller performs path recalculation according to the acquired link information, and injects the updated forwarding table into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch performs addressing forwarding on the data packet according to the updated forwarding table.
In order to implement the above method, a low-orbit satellite communication system is required. Fig. 2 is a schematic diagram of a fast routing method of a low-orbit satellite-borne network based on a pressed preset label in the system, where the fast routing method includes a source node T1 of a service, a destination node S1 of the service, a low-orbit satellite constellation (each satellite carries a satellite-borne switch, and satellites are provided with inter-satellite links to realize interconnection), and a space-based network controller.
Under normal conditions, service data is sent to a destination node S1 by a source node T1, addressing and forwarding are carried out on the service data by a satellite-borne switch according to a destination label L6 according to a main path calculated by a space-based network controller, and the path of a data packet is T1-T4-T5-T6-S1.
When the link between the L5 and the L6 fails, the satellite-borne switch of the L5 monitors the states of adjacent inter-satellite links in real time, judges that service data cannot be transmitted through the inter-satellite links between the L5 and the L6, then presses the backup label L3 into the front of the label L6 according to the backup path calculated by the previous space-based network controller, and the satellite-borne switch performs addressing forwarding according to the preset label L3. At this time, the service data is output from the 3 port of L5, and the path of the data packet is T1-T4-T5-T2-T3-T6-S1.
And the L5 reports the link information to the space-based network controller, the space-based network controller recalculates the route information and injects the route information into the corresponding satellite, the L5 satellite peels off the label L3, and the mapping relation between the label L6 and the port in the label table is updated from the L6-2 port to the L6-3 port. The data is then addressed and forwarded according to the T1-T4-T5-T2-T3-T6-S1 path.
In a word, in the low orbit satellite communication system, a forwarding table and a preset label are calculated in advance for a link to be protected, and the preset label is injected into a satellite-borne switch, when the satellite-borne switch detects that the link is invalid, the preset label is pressed into a data packet head, the invalid node or the link is bypassed according to a backup label, the affected service is transferred to the backup path in the shortest time and is sent to a destination node, then the satellite-borne switch reports the link information to an antenna-based network controller, the controller performs path recalculation according to the link information, the updated label forwarding table is injected into the corresponding satellite-borne switch, and the satellite-borne switch performs addressing forwarding on the data packet according to the updated label forwarding table, so that the inter-satellite link of the low orbit satellite bearing network is rapidly protected.
The invention is suitable for finding the backup path of service transmission in the shortest time when the node or the link in the low orbit satellite network fails, thereby keeping the service path smooth, reducing transmission delay, flow loss and out-of-order, ensuring the reliable transmission of service data and improving the communication efficiency and instantaneity.
Claims (6)
1. The method for rapidly protecting the inter-satellite link of the low-rail bearing network based on the pressed preset label is characterized by comprising the following steps of:
(1) The space-based network controller calculates a label forwarding table of each satellite node and a preset label after each link is invalid in the low-orbit satellite bearing network according to satellite ephemeris information, and injects the preset label into a satellite-borne switch of a corresponding satellite, and the satellite-borne switch searches the label forwarding table through a destination label encapsulated in a data packet to carry out addressing forwarding;
(2) When the satellite-borne switch detects that the link between the connected satellites is invalid, pressing the preset label into the data packet head, and then addressing and forwarding the data packet through the label forwarding table in the step (1) according to the newly pressed preset label by the satellite-borne switch;
(3) The satellite-borne switch reports the detection information of the link failure to the space-based network controller;
(4) The space-based network controller re-performs forwarding table and label centralized calculation according to the detection information of the link failure, and injects the calculation result into each satellite-borne switch in the form of a new label forwarding table;
(5) And (3) after the satellite-borne switch receives the new label forwarding table, searching the new label forwarding table according to the target label in the step (1) for forwarding.
2. The method for quickly protecting the inter-satellite links of the low-rail load network based on the pressed preset labels according to claim 1, wherein in the step (1), an inter-satellite network topology in one orbit period is divided into a plurality of time slices by a space-based network controller according to satellite ephemeris information, route calculation is carried out for each time slice, and a calculation result is uploaded to an on-satellite switch of a corresponding satellite in a label forwarding table form; in addition, for each time slice, a preset label of the connected inter-satellite link is calculated for each node, and the calculation result is injected into the satellite-borne switch of the corresponding satellite.
3. The method for quickly protecting a low-rail load inter-satellite link based on a pressed preset label according to claim 1, wherein the destination label encapsulated in the data packet in the step (1) is an original destination label before the link fails.
4. The method for quickly protecting the inter-satellite link of the low-rail load network based on the pressed preset label according to claim 1, wherein the label forwarding table calculated by the space-based network controller in the step (1) comprises the corresponding relation between the target label and the output port.
5. The method for quickly protecting the inter-satellite link of the low-rail load network based on the pressed preset label according to claim 1, wherein in the step (2), the packaging position of the preset label is located before the destination label in the step (1); and after the link is invalid, bypassing the invalid link through the preset label.
6. The method for fast protecting inter-satellite links of low-rail load network based on push preset labels according to claim 4, wherein the new label forwarding table in step (4) updates egress port information compared with the label forwarding table in step (1), and the egress port information guides the data packet to bypass the failed link for addressing and forwarding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111133773.3A CN114124189B (en) | 2021-09-27 | 2021-09-27 | Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111133773.3A CN114124189B (en) | 2021-09-27 | 2021-09-27 | Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114124189A CN114124189A (en) | 2022-03-01 |
| CN114124189B true CN114124189B (en) | 2024-04-16 |
Family
ID=80441258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111133773.3A Active CN114124189B (en) | 2021-09-27 | 2021-09-27 | Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114124189B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3373532A1 (en) * | 2017-03-10 | 2018-09-12 | Juniper Networks, Inc. | Apparatus, system, and method for providing node protection across label-switched paths that share labels |
| CN111865778A (en) * | 2020-06-24 | 2020-10-30 | 北京邮电大学 | Satellite laser link periodic interruption solution method and device based on time labels |
| CN112752286A (en) * | 2020-12-31 | 2021-05-04 | 网络通信与安全紫金山实验室 | Centralized networking method, device, equipment and storage medium for satellite network |
| CN112995033A (en) * | 2021-02-26 | 2021-06-18 | 中国电子科技集团公司第五十四研究所 | Space-based network satellite-ground integrated exchange method based on labels |
-
2021
- 2021-09-27 CN CN202111133773.3A patent/CN114124189B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3373532A1 (en) * | 2017-03-10 | 2018-09-12 | Juniper Networks, Inc. | Apparatus, system, and method for providing node protection across label-switched paths that share labels |
| CN111865778A (en) * | 2020-06-24 | 2020-10-30 | 北京邮电大学 | Satellite laser link periodic interruption solution method and device based on time labels |
| CN112752286A (en) * | 2020-12-31 | 2021-05-04 | 网络通信与安全紫金山实验室 | Centralized networking method, device, equipment and storage medium for satellite network |
| CN112995033A (en) * | 2021-02-26 | 2021-06-18 | 中国电子科技集团公司第五十四研究所 | Space-based network satellite-ground integrated exchange method based on labels |
Non-Patent Citations (1)
| Title |
|---|
| 基于低轨移动星座的高速星载路由器设计;吕原草 等;中国空间科学技术;20191016(第06期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114124189A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7801028B2 (en) | Method and apparatus for transparent auto-recovery in chain and ring networks | |
| EP1522174B1 (en) | Apparatus and method for a virtual hierarchial local area network | |
| US6813241B1 (en) | Network architecture and method of providing link protection in a bidirectional data traffic network | |
| EP1843544B1 (en) | A data transmission method and system of label switching network | |
| US20120039164A1 (en) | System And Method Of Implementing Lightweight Not-Via IP Fast Reroutes In A Telecommunications Network | |
| US20060245422A1 (en) | Network fabric access device with multiple system side interfaces | |
| CN106788666B (en) | Double-layer satellite grouping routing method based on virtual L EO group node | |
| EP2084866A1 (en) | Network availability enhancement technique for packet transport networks | |
| KR19980025189A (en) | Method and apparatus for adaptive routing of satellite based communication system | |
| CN113784416B (en) | Dynamic route updating system and method based on low-orbit satellite network control | |
| CN101656630A (en) | Service protection method and system | |
| JP4297636B2 (en) | Transmission system | |
| US20060209877A1 (en) | Communication system, communication card, and communication method | |
| EP1940091B1 (en) | Autonomous network, node device, network redundancy method and recording medium | |
| AU698097B2 (en) | Route finding in communications networks | |
| CN101783743A (en) | Business protection method and switching node | |
| CN113852415B (en) | Global flow scheduling method suitable for low-orbit satellite network | |
| CN114124189B (en) | Low-rail load-bearing inter-satellite link rapid protection method based on pressed preset label | |
| CN114268593A (en) | SDN-based space satellite network source routing forwarding method and device | |
| US20030043735A1 (en) | Packet transmission method | |
| CN104618057B (en) | A kind of Packet Transport Network not damaged protection reverse method and system | |
| CN117639893A (en) | Star-earth routing method and system for space-based bearing network | |
| US20010029546A1 (en) | Inter-LAN communication device and inter-LAN communication network employing the same | |
| CN115426034B (en) | Satellite network networking method based on label routing | |
| US20040072562A1 (en) | Mobile communications system for use with first and second set of user terminals and method for operating same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |